For buyers contracting authority
Reach for 48732000 when the purchase is a packaged product that secures data: an encryption suite, a PKI or certificate platform, a DLP system, or a threat-detection product such as a SIEM. The defining test is whether the contract licenses software, not whether it commissions bespoke development or buys an ongoing managed service.
The boundary that trips contracting authorities is the sibling 48731000. File security software is scoped to protecting files specifically; 48732000 is the broader data-security tier and is the right code when the tool guards data more generally (in transit, in databases, across endpoints). When in doubt between the two, the wider 48732000 is usually the safer pick.
Two more lines matter. If the work is custom engineering of a security tool rather than a licence, that is Data security software development services (72212732), a services code in the 72 branch. And where a deal bundles the software with installation, configuration or first-year support, keep it here as long as the licensed product is the dominant purpose of the contract.